Reddit noob question

So I've been on reddit since August, and I'm joining subs and realizing I can't post in a lot of them yet...how do I know what a sub's rules are for when I can post in it? What's the point of joining a sub to ask a question if you can't post in it until you answer other questions or discuss, when you might not have a clue about the topic yet?

(I put off joining for so long because I heard it was toxic, and I do see that, but there are some really nice subs too :))

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